# Who can explain me the marked part?

1. Apr 7, 2006

### zhangpujumbo

in the attachment.

Why the grand total angular momentum is 0?

thank u!

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2. Apr 7, 2006

### nrqed

The notation is explained a few lines above! It's $\,^{2s+1}L_j$ so the subscript "0" tells you that the state has j=0!